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However, the cervical spine is comparatively mobile, and some component of this movement is due to flexion and extension of the vertebral column itself. This movement between the atlas and occipital bone is often referred to as the "yes joint", owing to its nature of being able to move the head in an up-and-down fashion.
In anatomy, the atlas (C1) is the most superior (first) cervical vertebra of the spine and is located in the neck. The bone is named for Atlas of Greek mythology, just as Atlas bore the weight of the heavens, the first cervical vertebra supports the head. [1]
In anatomy, the neck is also referred to as the cervix or collum. However, when the term cervix is used alone, it often refers to the uterine cervix , the neck of the uterus. [ 3 ] Therefore, the adjective cervical can refer either to the neck (as in cervical vertebrae or cervical lymph nodes ) or to the uterine cervix (as in ...
The longus colli muscle (Latin for long muscle of the neck) is a muscle of the human body.. The longus colli is situated on the anterior surface of the vertebral column, between the atlas and the third thoracic vertebra.
The cruciate ligament of the atlas consists of the transverse ligament of the atlas, a superior longitudinal band, and an inferior longitudinal band. [1] [2] The superior longitudinal band connects the transverse ligament to the anterior side of the foramen magnum (near the basilar part) in the occipital bone of the skull.
All of the infrahyoid muscles are innervated by the ansa cervicalis from the cervical plexus (C1-C3) [4] [5] except the thyrohyoid muscle, which is innervated by fibers only from the first cervical spinal nerve travelling with the hypoglossal nerve.
The omohyoid is innervated by the ansa cervicalis of the cervical plexus. [2] The inferior belly is innervated by the ansa cervicalis itself (which is derived from cervical spinal nerves C1-C3), and the superior belly is innervated by the superior root of ansa cervicalis (which is derived from the first cervical spinal nerve (C1)). [1]
They allow for flexion and extension and limit lateral flexion in the cervical spine. Pathological processes that can occur in these joints include degenerative changes or hypertrophic arthritis, resulting in foraminal stenosis and nerve compression. Foraminal stenosis at this joint is the most common cause of cervical nerve root pressure.
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